Tektronix 434 s/n below 500000 faulty ps.

[Craig]

It can only be overheating if it is passing too much current. Where do you think the current is going?

Hint: The only components R926 is connected to are CR924, CR925, C924, C925 and C926.

So measure the voltage between the junction of R926 and C926 and tell us what it is.